Should a sedan's radiator be filled with water or coolant?
2 Answers
Sedan radiators should be filled with coolant. If water circulates through the engine, especially during major circulation when it flows into the radiator behind the grille, impure water can create scale deposits that clog the cooling system. This can lead to engine power loss and increased wear. Additionally, high-temperature water is prone to evaporation, causing coolant deficiency in the system, which may result in cylinder scoring, cylinder head deformation, or even complete engine failure in severe cases. Coolant is a specially formulated fluid containing additives, primarily used in liquid-cooled engine cooling systems. It offers excellent properties such as freeze protection in winter, boil-over prevention in summer, year-round anti-scaling, and corrosion resistance. It prevents the cooling liquid from freezing and expanding in cold winter conditions, which could otherwise crack the radiator or damage the engine block and cylinder head.
I've been driving for several years and always believed that the radiator must be filled with antifreeze, not just water. Although adding water is simple and cost-effective, the entire system can freeze and burst in sub-zero temperatures during winter, and it's prone to boiling over in high summer heat, damaging the engine. My cousin spent over 2,000 yuan on repairs because he used water—totally not worth it. Antifreeze, with its specialized formula, can prevent freezing down to -40 degrees, resist corrosion, and prevent boiling, protecting both the radiator and the engine. Remember to regularly check the fluid level; if it's below the MIN line, top it up immediately—don't slack off. When I buy a new car, I always check the manual for the recommended type, as different vehicles require different antifreeze. It's best to inspect it once when seasons change to ensure safe driving.
